Date Calculator

What is the Date Calculation Tool?

The Date Calculator is a free online tool that allows you to calculate the time between two dates and move forward or backward a specified period from a reference date. It can be used to check delivery dates, contract periods, travel itineraries, the number of days until an event, application deadlines, and more.

When calculating date differences, in addition to the period in calendar years, months, and days, the total number of days, total number of weeks, and the number of weekdays (excluding Saturdays and Sundays) are displayed. If you select “Include end date in count,” both the start date and end date are counted as one day each.

When adding or subtracting time, you can specify a combination of years, months, weeks, and days. If the target date does not contain the same day as the source date (e.g., adding one month to January 31), the date will be adjusted to the last day of that month. All calculations are performed within the browser.

What You Can Do

• Displays the difference between two dates on the calendar in years, months, and days.
• Displays the total number of days and the estimated number of weeks.
• Displays the number of weekdays, excluding Saturdays and Sundays. Public holidays are not excluded from the weekday count.
• Add or subtract years, months, weeks, and days from the specified date.
• Calculations take into account the end of the month and leap years.

How to Use

1. Select "Date Difference" or "Addition/Subtraction" from "Calculation Method."
2. Enter the required dates and time periods.
3. Click "Calculate Date."
4. Review the calculation results and details.
5. Click "Copy Results" as needed.

Precautions for Use

• The number of weekdays excludes only Saturdays and Sundays. National holidays, company holidays, and regional holidays are not taken into account.
• When calculating the difference in number of days excluding the end date, the difference between two identical dates is 0 days.
• When adding or subtracting on a monthly basis, if the target month does not have the same date, use the last day of the month.
• Legal and contractual deadlines may have their own specific rules regarding the start and end dates. Please verify important deadlines with the relevant authorities or by reviewing the terms of the contract.

Frequently Asked Questions

Can you calculate how many days there are from today until a specified date?

Yes. If you enter today as the start date and a specific date as the end date, you can check the total number of days.

Can you include both the start date and the end date in the count?

Yes. Please select “Include the end date in the count.” This will include both the start date and the end date in the count.

What is the difference in days between two dates?

It is usually 0 days. If you set it to include the end date, it becomes 1 day.

Can you calculate the number of days excluding weekends?

Yes. The results will display the number of weekdays, excluding Saturdays and Sundays.

Are holidays excluded from the count of weekdays?

No. Since public holidays vary by country and region, this tool excludes only Saturdays and Sundays.

Can I add one month to the date?

Yes. Please enter "1" per month in either the addition or subtraction mode.

What happens if you add one month to January 31?

Since the destination month does not have 31 days, the date will be adjusted to the last day of that month.

Can I specify the year, month, week, and day at the same time?

Yes. You can combine multiple units to add or subtract them all at once.

Does it support leap years?

Yes. We'll factor in the number of days in February and February 29 when calculating.

Will the date I entered be saved?

No. The calculation is performed within the browser, and the date you enter is not sent to the server.

Is it free to use?

Yes. You can use it for free without registration.